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TPS40210EVM: Vout Peak-to-Peak

Part Number: TPS40210EVM
Other Parts Discussed in Thread: TPS40210


i had some issues with the TPS40210EVM. I used the original eval-board (Vin: 8V - 14V / Vout: 24V / Iout: 2A).

I measured the Vout and the ripple of it and it seems to be a problem there. You can see the measurements in the pics below.

The ripple is over 2Vpp. I measured on the Vout (J2) not on the testpoints. According th the datasheet the ripple should be around 500 mVpp.


The ripple creates radiation that shouldn't be there. What can i do to reduce the ripple?

I tried different capacitors on the output, but it didn't work very well.

Is there a easy way to change the FB or the COMP to reduce the ripple?

If i use WEBENCH POWER DESIGNER for the TPS40210, it is a different schematic and not how it is described in the datasheet.

Data WEBENCH (Vin 8-14V / Vout 24V / Iout 2A)

Can someone help me out?


  • Hello Frederic,

    The ripple in your second measurement is below 500mV.

    Every power supply creates in addition to the ripple a high frequency noise which is very difficult to measure. Please review this technical article: 

    Is it possible that you are using the first measurement method described in this article (the noise is mostly caused by measurement parasitics then)? If this is the case, please try method 2 with the minimized loop and measure at the output capacitor.